/**
 * 
 */
package com.movitech.mobile.cz.base.common.utils;
import java.security.SecureRandom;
import java.util.UUID;

import org.activiti.engine.impl.cfg.IdGenerator;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Service;

/**
 * 封装各种生成唯一性ID算法的工具类.
 * @author ThinkGem
 * @version 2013-01-15
 */
@Service
@Lazy(false)
public class IdGen implements IdGenerator {

    private static SecureRandom random = new SecureRandom();
    
    /**
     * 封装JDK自带的UUID, 通过Random数字生成, 中间无-分割.
     */
    public static String uuid() {
        return UUID.randomUUID().toString().replaceAll("-", "");
    }
    
    /**
     * 使用SecureRandom随机生成Long. 
     */
    public static long randomLong() {
    	long number;
    	long lTemp = random.nextLong();
        if(lTemp != Long.MIN_VALUE) {
        	number = Math.abs(lTemp);
        } else {
        	number = Long.MIN_VALUE;
        }
        
        return number;
    }
    
    /**
     * Activiti ID 生成
     */
    @Override
    public String getNextId() {
        return IdGen.uuid();
    }
}
